By FAGIOLO G   WALDMAN A   HAJNAL J V   in British Journal of Radiology

ISSN:0007-1285|81|963|250-251

British Institute of Radiology‎(2008)‎

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By Fagiolo G.   Dosi G.   in Structural Change and Economic Dynamics

ISSN:0954-349X|14|3|237-273

Elsevier‎(2003)‎

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